To look at this differently, though, I would think that at some level GOOG and the other engines want to be able to accurately index content for their users, ho

To look at this differently, though, I would think that at some level GOOG and the other engines want to be able to accurately index content for their users, however it's generated on a given site. Obviously in past this tended to go the other way, a site's static content appeared to be one thing, but client-side scripts did various sneaky things to it, which is one reason Google traditionally processed js and css to some degree. But though that's still a concern, it's actually less of a problem if they are just running a webdriver over your site to figure out what it is.